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基于准确计算环的外信息度,提出了ACE算法的改进算法。该算法利用外在信息度能准确表示环的外节点状况,构造了优化连通性的LDPC码。针对LDPC码构造过程中出现的连通性差的短环,增加了破环操作,这样可以较好的改善局部连通性差的LDPC码的结构。实验结果证明,本文的改进算法降低了错误平层,提高了码的性能。
Based on the accurate information of outer ring information, an improved ACE algorithm is proposed. The algorithm uses the external information to accurately represent the condition of the outer nodes of the ring and constructs an optimized connectivity LDPC code. For the short loop with poor connectivity in the construction of LDPC codes, the broken loop operation is added, so that the structure of the LDPC codes with poor local connectivity can be better improved. The experimental results show that the improved algorithm in this paper reduces the error leveling and improves the code performance.